McKee Glass Refrigerator Set in Red Green and Blue

I just found this McKee glass refrigerator set in the Finger Lakes area in New York state a couple of weeks ago. It's the first McKee glass I had ever seen. It's kind of a precursor to Pyrex. These three dishes for leftovers or whatever are made to be stackable and each has a corresponding glass lid. This set is in absolute mint condition and does not look used at all. Amazing!

I was wondering if anyone could tell me how rare it is to find a complete set like this and in such good condition. Or am I just wishful thinking?